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http://dx.doi.org/10.3740/MRSK.2008.18.4.193

Gas Sensing Characteristics of WO3-Doped SnO2 Thin Films Prepared by Solution Deposition Method  

Choi, Joong-Ki (Department of Materials Science and Engineering)
Cho, Pyeong-Seok (Department of Materials Science and Engineering)
Lee, Jong-Heun (Department of Materials Science and Engineering)
Publication Information
Korean Journal of Materials Research / v.18, no.4, 2008 , pp. 193-198 More about this Journal
Abstract
$WO_3$-doped $SnO_2$ thin films were prepared in a solution-deposition method and their gas-sensing characteristics were investigated. The doping of $WO_3$ to $SnO_2$ increased the response ($R_a/R_g,\;R_a$: resistance in air, $R_g$: resistance in gas) to $H_2$ substantially. Moreover, the $R_a/R_g$ value of 10 ppm CO increased to 5.65, whereas that of $NO_2$ did not change by a significant amount. The enhanced response to $H_2$ and the selective detection of CO in the presence of $NO_2$ were explained in relation to the change in the surface reaction by the addition of $WO_3$. The $WO_3$-doped $SnO_2$ sensor can be used with the application of a $H_2$ sensor for vehicles that utilize fuel cells and as an air quality sensor to detect CO-containing exhaust gases emitted from gasoline engines.
Keywords
$SnO_2$; $WO_3$; gas sensor; solution deposition method;
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